netdev - RE: ipgre rss is broken since gro

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Date:	Mon, 10 Dec 2012 19:20:25 +0000
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
cc:	"Eric Dumazet" <edumazet@...gle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: ipgre rss is broken since gro

> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Monday, December 10, 2012 6:55 PM
> To: Dmitry Kravkov
> Cc: Eric Dumazet; netdev@...r.kernel.org
> Subject: RE: ipgre rss is broken since gro
> 
> On Mon, 2012-12-10 at 11:32 +0000, Dmitry Kravkov wrote:
> 
> 
> dropped:51610  so obviously  one cpu is fully loaded.
Link partner continued pushing data overnight

> 
> I believe performance problem might come from the
> skb_set_queue_mapping(skb, 0); in __skb_tunnel_rx()
> 
> So all packets are queued into a single GRO queue, instead of being
> split as intended in multiple queues.
> 
> I cant find why we must clear queue_mapping, so could you try :
> 
> 
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 9a78810..4cb27df 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -329,7 +329,6 @@ static inline void __skb_tunnel_rx(struct sk_buff *skb,
> struct net_device *dev)
>  	 */
>  	if (!skb->l4_rxhash)
>  		skb->rxhash = 0;
> -	skb_set_queue_mapping(skb, 0);
>  	skb_dst_drop(skb);
>  	nf_reset(skb);
>  }
> 
Yep, this resolved the issue - Interface is functional after 3 and 100 TCP connections. Thanks